In the ICFP Programming Contest you have exactly 72 hours to solve a problem and submit a solution via the Internet, using any language on any platform with a team of any size. I was alone and used epsilon.

The contest was a good test of the language, even if it's still immature.
In this sense it was a success: I submitted a perfectly correct and elegant
solution in time. I scored in the bottom half. Next year epsilon will be
more powerful, and I hope to make better.